A new National Institutes of Health study is lending credence to vision therapy as a treatment for convergence insufficiency, a vision disorder that may affect one of every eight people across the United States.

Convergence insufficiency occurs when the eyes have difficulty looking at objects close up because they drift, causing double vision and other reading problems.

Jill Buss, the mother of three grade-school children in north Orem, said reading was always an uphill battle for her seven-year-old son. He underwent three eye surgeries in the first years of life to correct congenital problems before they tried vision therapy.

“We were working very hard — I was reading with him every day, there was a tutor working with him twice a week, we were going to a computer tutoring lab,” she said.